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d74468e348
rocksdb/options/cf_options.cc
Peter Dillinger e24734f843 Use -Wno-invalid-offsetof instead of dangerous offset_of hack (#9563) 
Summary:
After https://github.com/facebook/rocksdb/issues/9515 added a unique_ptr to Status, we see some
warnings-as-error in some internal builds like this:

```
stderr: rocksdb/src/db/compaction/compaction_job.cc:2839:7: error:
offset of on non-standard-layout type 'struct CompactionServiceResult'
[-Werror,-Winvalid-offsetof]
     {offsetof(struct CompactionServiceResult, status),
      ^                                        ~~~~~~
```

I see three potential solutions to resolving this:

* Expand our use of an idiom that works around the warning (see offset_of
functions removed in this change, inspired by
https://gist.github.com/graphitemaster/494f21190bb2c63c5516)  However,
this construction is invoking undefined behavior that assumes consistent
layout with no compiler-introduced indirection. A compiler incompatible
with our assumptions will likely compile the code and exhibit undefined
behavior.
* Migrate to something in place of offset, like a function mapping
CompactionServiceResult* to Status* (for the `status` field). This might
be required in the long term.
* **Selected:** Use our new C++17 dependency to use offsetof in a well-defined way
when the compiler allows it. From a comment on
https://gist.github.com/graphitemaster/494f21190bb2c63c5516:

> A final note: in C++17, offsetof is conditionally supported, which
> means that you can use it on any type (not just standard layout
> types) and the compiler will error if it can't compile it correctly.
> That appears to be the best option if you can live with C++17 and
> don't need constexpr support.

The C++17 semantics are confirmed on
https://en.cppreference.com/w/cpp/types/offsetof, so we can suppress the
warning as long as we accept that we might run into a compiler that
rejects the code, and at that point we will find a solution, such as
the more intrusive "migrate" solution above.

Although this is currently only showing in our buck build, it will
surely show up also with make and cmake, so I have updated those
configurations as well.

Also in the buck build, -Wno-expansion-to-defined does not appear to be
needed anymore (both current compiler configurations) so I
removed it.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9563

Test Plan: Tried out buck builds with both current compiler configurations

Reviewed By: riversand963

Differential Revision: D34220931

Pulled By: pdillinger

fbshipit-source-id: d39436008259bd1eaaa87c77be69fb2a5b559e1f
2022-02-15 09:19:19 -08:00

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#include "options/cf_options.h"
#include <cassert>
#include <cinttypes>
#include <limits>
#include <string>
#include "logging/logging.h"
#include "options/configurable_helper.h"
#include "options/db_options.h"
#include "options/options_helper.h"
#include "options/options_parser.h"
#include "port/port.h"
#include "rocksdb/compaction_filter.h"
#include "rocksdb/concurrent_task_limiter.h"
#include "rocksdb/configurable.h"
#include "rocksdb/convenience.h"
#include "rocksdb/env.h"
#include "rocksdb/file_system.h"
#include "rocksdb/merge_operator.h"
#include "rocksdb/options.h"
#include "rocksdb/table.h"
#include "rocksdb/utilities/object_registry.h"
#include "rocksdb/utilities/options_type.h"
#include "util/cast_util.h"
// NOTE: in this file, many option flags that were deprecated
// and removed from the rest of the code have to be kept here
// and marked as kDeprecated in order to be able to read old
// OPTIONS files.
namespace ROCKSDB_NAMESPACE {
#ifndef ROCKSDB_LITE
static Status ParseCompressionOptions(const std::string& value,
const std::string& name,
CompressionOptions& compression_opts) {
const char kDelimiter = ':';
std::istringstream field_stream(value);
std::string field;
if (!std::getline(field_stream, field, kDelimiter)) {
return Status::InvalidArgument("unable to parse the specified CF option " +
name);
}
compression_opts.window_bits = ParseInt(field);
if (!std::getline(field_stream, field, kDelimiter)) {
return Status::InvalidArgument("unable to parse the specified CF option " +
name);
}
compression_opts.level = ParseInt(field);
if (!std::getline(field_stream, field, kDelimiter)) {
return Status::InvalidArgument("unable to parse the specified CF option " +
name);
}
compression_opts.strategy = ParseInt(field);
// max_dict_bytes is optional for backwards compatibility
if (!field_stream.eof()) {
if (!std::getline(field_stream, field, kDelimiter)) {
return Status::InvalidArgument(
"unable to parse the specified CF option " + name);
}
compression_opts.max_dict_bytes = ParseInt(field);
}
// zstd_max_train_bytes is optional for backwards compatibility
if (!field_stream.eof()) {
if (!std::getline(field_stream, field, kDelimiter)) {
return Status::InvalidArgument(
"unable to parse the specified CF option " + name);
}
compression_opts.zstd_max_train_bytes = ParseInt(field);
}
// parallel_threads is optional for backwards compatibility
if (!field_stream.eof()) {
if (!std::getline(field_stream, field, kDelimiter)) {
return Status::InvalidArgument(
"unable to parse the specified CF option " + name);
}
// Since parallel_threads comes before enabled but was added optionally
// later, we need to check if this is the final token (meaning it is the
// enabled bit), or if there are more tokens (meaning this one is
// parallel_threads).
if (!field_stream.eof()) {
compression_opts.parallel_threads = ParseInt(field);
} else {
// parallel_threads is not serialized with this format, but enabled is
compression_opts.enabled = ParseBoolean("", field);
}
}
// enabled is optional for backwards compatibility
if (!field_stream.eof()) {
if (!std::getline(field_stream, field, kDelimiter)) {
return Status::InvalidArgument(
"unable to parse the specified CF option " + name);
}
compression_opts.enabled = ParseBoolean("", field);
}
// max_dict_buffer_bytes is optional for backwards compatibility
if (!field_stream.eof()) {
if (!std::getline(field_stream, field, kDelimiter)) {
return Status::InvalidArgument(
"unable to parse the specified CF option " + name);
}
compression_opts.max_dict_buffer_bytes = ParseUint64(field);
}
if (!field_stream.eof()) {
return Status::InvalidArgument("unable to parse the specified CF option " +
name);
}
return Status::OK();
}
const std::string kOptNameBMCompOpts = "bottommost_compression_opts";
const std::string kOptNameCompOpts = "compression_opts";
// OptionTypeInfo map for CompressionOptions
static std::unordered_map<std::string, OptionTypeInfo>
compression_options_type_info = {
{"window_bits",
{offsetof(struct CompressionOptions, window_bits), OptionType::kInt,
OptionVerificationType::kNormal, OptionTypeFlags::kMutable}},
{"level",
{offsetof(struct CompressionOptions, level), OptionType::kInt,
OptionVerificationType::kNormal, OptionTypeFlags::kMutable}},
{"strategy",
{offsetof(struct CompressionOptions, strategy), OptionType::kInt,
OptionVerificationType::kNormal, OptionTypeFlags::kMutable}},
{"max_dict_bytes",
{offsetof(struct CompressionOptions, max_dict_bytes), OptionType::kInt,
OptionVerificationType::kNormal, OptionTypeFlags::kMutable}},
{"zstd_max_train_bytes",
{offsetof(struct CompressionOptions, zstd_max_train_bytes),
OptionType::kUInt32T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"parallel_threads",
{offsetof(struct CompressionOptions, parallel_threads),
OptionType::kUInt32T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"enabled",
{offsetof(struct CompressionOptions, enabled), OptionType::kBoolean,
OptionVerificationType::kNormal, OptionTypeFlags::kMutable}},
{"max_dict_buffer_bytes",
{offsetof(struct CompressionOptions, max_dict_buffer_bytes),
OptionType::kUInt64T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
};
static std::unordered_map<std::string, OptionTypeInfo>
fifo_compaction_options_type_info = {
{"max_table_files_size",
{offsetof(struct CompactionOptionsFIFO, max_table_files_size),
OptionType::kUInt64T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"age_for_warm",
{offsetof(struct CompactionOptionsFIFO, age_for_warm),
OptionType::kUInt64T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"ttl",
{0, OptionType::kUInt64T, OptionVerificationType::kDeprecated,
OptionTypeFlags::kNone}},
{"allow_compaction",
{offsetof(struct CompactionOptionsFIFO, allow_compaction),
OptionType::kBoolean, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
};
static std::unordered_map<std::string, OptionTypeInfo>
universal_compaction_options_type_info = {
{"size_ratio",
{offsetof(class CompactionOptionsUniversal, size_ratio),
OptionType::kUInt, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"min_merge_width",
{offsetof(class CompactionOptionsUniversal, min_merge_width),
OptionType::kUInt, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"max_merge_width",
{offsetof(class CompactionOptionsUniversal, max_merge_width),
OptionType::kUInt, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"max_size_amplification_percent",
{offsetof(class CompactionOptionsUniversal,
max_size_amplification_percent),
OptionType::kUInt, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"compression_size_percent",
{offsetof(class CompactionOptionsUniversal, compression_size_percent),
OptionType::kInt, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"stop_style",
{offsetof(class CompactionOptionsUniversal, stop_style),
OptionType::kCompactionStopStyle, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"incremental",
{offsetof(class CompactionOptionsUniversal, incremental),
OptionType::kBoolean, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"allow_trivial_move",
{offsetof(class CompactionOptionsUniversal, allow_trivial_move),
OptionType::kBoolean, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}}};
static std::unordered_map<std::string, OptionTypeInfo>
cf_mutable_options_type_info = {
{"report_bg_io_stats",
{offsetof(struct MutableCFOptions, report_bg_io_stats),
OptionType::kBoolean, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"disable_auto_compactions",
{offsetof(struct MutableCFOptions, disable_auto_compactions),
OptionType::kBoolean, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"filter_deletes",
{0, OptionType::kBoolean, OptionVerificationType::kDeprecated,
OptionTypeFlags::kMutable}},
{"check_flush_compaction_key_order",
{offsetof(struct MutableCFOptions, check_flush_compaction_key_order),
OptionType::kBoolean, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"paranoid_file_checks",
{offsetof(struct MutableCFOptions, paranoid_file_checks),
OptionType::kBoolean, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"verify_checksums_in_compaction",
{0, OptionType::kBoolean, OptionVerificationType::kDeprecated,
OptionTypeFlags::kMutable}},
{"soft_pending_compaction_bytes_limit",
{offsetof(struct MutableCFOptions,
soft_pending_compaction_bytes_limit),
OptionType::kUInt64T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"hard_pending_compaction_bytes_limit",
{offsetof(struct MutableCFOptions,
hard_pending_compaction_bytes_limit),
OptionType::kUInt64T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"hard_rate_limit",
{0, OptionType::kDouble, OptionVerificationType::kDeprecated,
OptionTypeFlags::kMutable}},
{"soft_rate_limit",
{0, OptionType::kDouble, OptionVerificationType::kDeprecated,
OptionTypeFlags::kMutable}},
{"max_compaction_bytes",
{offsetof(struct MutableCFOptions, max_compaction_bytes),
OptionType::kUInt64T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"expanded_compaction_factor",
{0, OptionType::kInt, OptionVerificationType::kDeprecated,
OptionTypeFlags::kMutable}},
{"level0_file_num_compaction_trigger",
{offsetof(struct MutableCFOptions, level0_file_num_compaction_trigger),
OptionType::kInt, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"level0_slowdown_writes_trigger",
{offsetof(struct MutableCFOptions, level0_slowdown_writes_trigger),
OptionType::kInt, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"level0_stop_writes_trigger",
{offsetof(struct MutableCFOptions, level0_stop_writes_trigger),
OptionType::kInt, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"max_grandparent_overlap_factor",
{0, OptionType::kInt, OptionVerificationType::kDeprecated,
OptionTypeFlags::kMutable}},
{"max_write_buffer_number",
{offsetof(struct MutableCFOptions, max_write_buffer_number),
OptionType::kInt, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"source_compaction_factor",
{0, OptionType::kInt, OptionVerificationType::kDeprecated,
OptionTypeFlags::kMutable}},
{"target_file_size_multiplier",
{offsetof(struct MutableCFOptions, target_file_size_multiplier),
OptionType::kInt, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"arena_block_size",
{offsetof(struct MutableCFOptions, arena_block_size),
OptionType::kSizeT, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"inplace_update_num_locks",
{offsetof(struct MutableCFOptions, inplace_update_num_locks),
OptionType::kSizeT, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"max_successive_merges",
{offsetof(struct MutableCFOptions, max_successive_merges),
OptionType::kSizeT, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"memtable_huge_page_size",
{offsetof(struct MutableCFOptions, memtable_huge_page_size),
OptionType::kSizeT, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"memtable_prefix_bloom_huge_page_tlb_size",
{0, OptionType::kSizeT, OptionVerificationType::kDeprecated,
OptionTypeFlags::kMutable}},
{"write_buffer_size",
{offsetof(struct MutableCFOptions, write_buffer_size),
OptionType::kSizeT, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"memtable_prefix_bloom_bits",
{0, OptionType::kUInt32T, OptionVerificationType::kDeprecated,
OptionTypeFlags::kMutable}},
{"memtable_prefix_bloom_size_ratio",
{offsetof(struct MutableCFOptions, memtable_prefix_bloom_size_ratio),
OptionType::kDouble, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"memtable_prefix_bloom_probes",
{0, OptionType::kUInt32T, OptionVerificationType::kDeprecated,
OptionTypeFlags::kMutable}},
{"memtable_whole_key_filtering",
{offsetof(struct MutableCFOptions, memtable_whole_key_filtering),
OptionType::kBoolean, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"min_partial_merge_operands",
{0, OptionType::kUInt32T, OptionVerificationType::kDeprecated,
OptionTypeFlags::kMutable}},
{"max_bytes_for_level_base",
{offsetof(struct MutableCFOptions, max_bytes_for_level_base),
OptionType::kUInt64T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"snap_refresh_nanos",
{0, OptionType::kUInt64T, OptionVerificationType::kDeprecated,
OptionTypeFlags::kMutable}},
{"max_bytes_for_level_multiplier",
{offsetof(struct MutableCFOptions, max_bytes_for_level_multiplier),
OptionType::kDouble, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"max_bytes_for_level_multiplier_additional",
OptionTypeInfo::Vector<int>(
offsetof(struct MutableCFOptions,
max_bytes_for_level_multiplier_additional),
OptionVerificationType::kNormal, OptionTypeFlags::kMutable,
{0, OptionType::kInt})},
{"max_sequential_skip_in_iterations",
{offsetof(struct MutableCFOptions, max_sequential_skip_in_iterations),
OptionType::kUInt64T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"target_file_size_base",
{offsetof(struct MutableCFOptions, target_file_size_base),
OptionType::kUInt64T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"compression",
{offsetof(struct MutableCFOptions, compression),
OptionType::kCompressionType, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"prefix_extractor",
OptionTypeInfo::AsCustomSharedPtr<const SliceTransform>(
offsetof(struct MutableCFOptions, prefix_extractor),
OptionVerificationType::kByNameAllowNull,
(OptionTypeFlags::kMutable | OptionTypeFlags::kAllowNull))},
{"compaction_options_fifo",
OptionTypeInfo::Struct(
"compaction_options_fifo", &fifo_compaction_options_type_info,
offsetof(struct MutableCFOptions, compaction_options_fifo),
OptionVerificationType::kNormal, OptionTypeFlags::kMutable,
[](const ConfigOptions& opts, const std::string& name,
const std::string& value, void* addr) {
// This is to handle backward compatibility, where
// compaction_options_fifo could be assigned a single scalar
// value, say, like "23", which would be assigned to
// max_table_files_size.
if (name == "compaction_options_fifo" &&
value.find("=") == std::string::npos) {
// Old format. Parse just a single uint64_t value.
auto options = static_cast<CompactionOptionsFIFO*>(addr);
options->max_table_files_size = ParseUint64(value);
return Status::OK();
} else {
return OptionTypeInfo::ParseStruct(
opts, "compaction_options_fifo",
&fifo_compaction_options_type_info, name, value, addr);
}
})},
{"compaction_options_universal",
OptionTypeInfo::Struct(
"compaction_options_universal",
&universal_compaction_options_type_info,
offsetof(struct MutableCFOptions, compaction_options_universal),
OptionVerificationType::kNormal, OptionTypeFlags::kMutable)},
{"ttl",
{offsetof(struct MutableCFOptions, ttl), OptionType::kUInt64T,
OptionVerificationType::kNormal, OptionTypeFlags::kMutable}},
{"periodic_compaction_seconds",
{offsetof(struct MutableCFOptions, periodic_compaction_seconds),
OptionType::kUInt64T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"bottommost_temperature",
{offsetof(struct MutableCFOptions, bottommost_temperature),
OptionType::kTemperature, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"enable_blob_files",
{offsetof(struct MutableCFOptions, enable_blob_files),
OptionType::kBoolean, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"min_blob_size",
{offsetof(struct MutableCFOptions, min_blob_size),
OptionType::kUInt64T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"blob_file_size",
{offsetof(struct MutableCFOptions, blob_file_size),
OptionType::kUInt64T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"blob_compression_type",
{offsetof(struct MutableCFOptions, blob_compression_type),
OptionType::kCompressionType, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"enable_blob_garbage_collection",
{offsetof(struct MutableCFOptions, enable_blob_garbage_collection),
OptionType::kBoolean, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"blob_garbage_collection_age_cutoff",
{offsetof(struct MutableCFOptions, blob_garbage_collection_age_cutoff),
OptionType::kDouble, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"blob_garbage_collection_force_threshold",
{offsetof(struct MutableCFOptions,
blob_garbage_collection_force_threshold),
OptionType::kDouble, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"blob_compaction_readahead_size",
{offsetof(struct MutableCFOptions, blob_compaction_readahead_size),
OptionType::kUInt64T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"sample_for_compression",
{offsetof(struct MutableCFOptions, sample_for_compression),
OptionType::kUInt64T, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{"bottommost_compression",
{offsetof(struct MutableCFOptions, bottommost_compression),
OptionType::kCompressionType, OptionVerificationType::kNormal,
OptionTypeFlags::kMutable}},
{kOptNameCompOpts,
OptionTypeInfo::Struct(
kOptNameCompOpts, &compression_options_type_info,
offsetof(struct MutableCFOptions, compression_opts),
OptionVerificationType::kNormal,
(OptionTypeFlags::kMutable | OptionTypeFlags::kCompareNever),
[](const ConfigOptions& opts, const std::string& name,
const std::string& value, void* addr) {
// This is to handle backward compatibility, where
// compression_options was a ":" separated list.
if (name == kOptNameCompOpts &&
value.find("=") == std::string::npos) {
auto* compression = static_cast<CompressionOptions*>(addr);
return ParseCompressionOptions(value, name, *compression);
} else {
return OptionTypeInfo::ParseStruct(
opts, kOptNameCompOpts, &compression_options_type_info,
name, value, addr);
}
})},
{kOptNameBMCompOpts,
OptionTypeInfo::Struct(
kOptNameBMCompOpts, &compression_options_type_info,
offsetof(struct MutableCFOptions, bottommost_compression_opts),
OptionVerificationType::kNormal,
(OptionTypeFlags::kMutable | OptionTypeFlags::kCompareNever),
[](const ConfigOptions& opts, const std::string& name,
const std::string& value, void* addr) {
// This is to handle backward compatibility, where
// compression_options was a ":" separated list.
if (name == kOptNameBMCompOpts &&
value.find("=") == std::string::npos) {
auto* compression = static_cast<CompressionOptions*>(addr);
return ParseCompressionOptions(value, name, *compression);
} else {
return OptionTypeInfo::ParseStruct(
opts, kOptNameBMCompOpts, &compression_options_type_info,
name, value, addr);
}
})},
// End special case properties
};
static std::unordered_map<std::string, OptionTypeInfo>
cf_immutable_options_type_info = {
/* not yet supported
CompressionOptions compression_opts;
TablePropertiesCollectorFactories table_properties_collector_factories;
using TablePropertiesCollectorFactories =
std::vector<std::shared_ptr<TablePropertiesCollectorFactory>>;
UpdateStatus (*inplace_callback)(char* existing_value,
uint34_t* existing_value_size,
Slice delta_value,
std::string* merged_value);
std::vector<DbPath> cf_paths;
*/
{"compaction_measure_io_stats",
{0, OptionType::kBoolean, OptionVerificationType::kDeprecated,
OptionTypeFlags::kNone}},
{"purge_redundant_kvs_while_flush",
{0, OptionType::kBoolean, OptionVerificationType::kDeprecated,
OptionTypeFlags::kNone}},
{"inplace_update_support",
{offsetof(struct ImmutableCFOptions, inplace_update_support),
OptionType::kBoolean, OptionVerificationType::kNormal,
OptionTypeFlags::kNone}},
{"level_compaction_dynamic_level_bytes",
{offsetof(struct ImmutableCFOptions,
level_compaction_dynamic_level_bytes),
OptionType::kBoolean, OptionVerificationType::kNormal,
OptionTypeFlags::kNone}},
{"optimize_filters_for_hits",
{offsetof(struct ImmutableCFOptions, optimize_filters_for_hits),
OptionType::kBoolean, OptionVerificationType::kNormal,
OptionTypeFlags::kNone}},
{"force_consistency_checks",
{offsetof(struct ImmutableCFOptions, force_consistency_checks),
OptionType::kBoolean, OptionVerificationType::kNormal,
OptionTypeFlags::kNone}},
// Need to keep this around to be able to read old OPTIONS files.
{"max_mem_compaction_level",
{0, OptionType::kInt, OptionVerificationType::kDeprecated,
OptionTypeFlags::kNone}},
{"max_write_buffer_number_to_maintain",
{offsetof(struct ImmutableCFOptions,
max_write_buffer_number_to_maintain),
OptionType::kInt, OptionVerificationType::kNormal,
OptionTypeFlags::kNone, 0}},
{"max_write_buffer_size_to_maintain",
{offsetof(struct ImmutableCFOptions,
max_write_buffer_size_to_maintain),
OptionType::kInt64T, OptionVerificationType::kNormal,
OptionTypeFlags::kNone}},
{"min_write_buffer_number_to_merge",
{offsetof(struct ImmutableCFOptions, min_write_buffer_number_to_merge),
OptionType::kInt, OptionVerificationType::kNormal,
OptionTypeFlags::kNone, 0}},
{"num_levels",
{offsetof(struct ImmutableCFOptions, num_levels), OptionType::kInt,
OptionVerificationType::kNormal, OptionTypeFlags::kNone}},
{"bloom_locality",
{offsetof(struct ImmutableCFOptions, bloom_locality),
OptionType::kUInt32T, OptionVerificationType::kNormal,
OptionTypeFlags::kNone}},
{"rate_limit_delay_max_milliseconds",
{0, OptionType::kUInt, OptionVerificationType::kDeprecated,
OptionTypeFlags::kNone}},
{"compression_per_level",
OptionTypeInfo::Vector<CompressionType>(
offsetof(struct ImmutableCFOptions, compression_per_level),
OptionVerificationType::kNormal, OptionTypeFlags::kNone,
{0, OptionType::kCompressionType})},
{"comparator",
OptionTypeInfo::AsCustomRawPtr<const Comparator>(
offsetof(struct ImmutableCFOptions, user_comparator),
OptionVerificationType::kByName, OptionTypeFlags::kCompareLoose,
// Serializes a Comparator
[](const ConfigOptions& opts, const std::string&, const void* addr,
std::string* value) {
// it's a const pointer of const Comparator*
const auto* ptr = static_cast<const Comparator* const*>(addr);
// Since the user-specified comparator will be wrapped by
// InternalKeyComparator, we should persist the user-specified
// one instead of InternalKeyComparator.
if (*ptr == nullptr) {
*value = kNullptrString;
} else if (opts.mutable_options_only) {
*value = "";
} else {
const Comparator* root_comp = (*ptr)->GetRootComparator();
if (root_comp == nullptr) {
root_comp = (*ptr);
}
*value = root_comp->ToString(opts);
}
return Status::OK();
},
/* Use the default match function*/ nullptr)},
{"memtable_insert_with_hint_prefix_extractor",
OptionTypeInfo::AsCustomSharedPtr<const SliceTransform>(
offsetof(struct ImmutableCFOptions,
memtable_insert_with_hint_prefix_extractor),
OptionVerificationType::kByNameAllowNull, OptionTypeFlags::kNone)},
{"memtable_factory",
{offsetof(struct ImmutableCFOptions, memtable_factory),
OptionType::kCustomizable, OptionVerificationType::kByName,
OptionTypeFlags::kShared,
[](const ConfigOptions& opts, const std::string&,
const std::string& value, void* addr) {
std::unique_ptr<MemTableRepFactory> factory;
auto* shared =
static_cast<std::shared_ptr<MemTableRepFactory>*>(addr);
Status s =
MemTableRepFactory::CreateFromString(opts, value, &factory);
if (factory && s.ok()) {
shared->reset(factory.release());
}
return s;
}}},
{"memtable",
{offsetof(struct ImmutableCFOptions, memtable_factory),
OptionType::kCustomizable, OptionVerificationType::kAlias,
OptionTypeFlags::kShared,
[](const ConfigOptions& opts, const std::string&,
const std::string& value, void* addr) {
std::unique_ptr<MemTableRepFactory> factory;
auto* shared =
static_cast<std::shared_ptr<MemTableRepFactory>*>(addr);
Status s =
MemTableRepFactory::CreateFromString(opts, value, &factory);
if (factory && s.ok()) {
shared->reset(factory.release());
}
return s;
}}},
{"table_factory",
OptionTypeInfo::AsCustomSharedPtr<TableFactory>(
offsetof(struct ImmutableCFOptions, table_factory),
OptionVerificationType::kByName,
(OptionTypeFlags::kCompareLoose |
OptionTypeFlags::kStringNameOnly |
OptionTypeFlags::kDontPrepare))},
{"block_based_table_factory",
{offsetof(struct ImmutableCFOptions, table_factory),
OptionType::kCustomizable, OptionVerificationType::kAlias,
OptionTypeFlags::kShared | OptionTypeFlags::kCompareLoose,
// Parses the input value and creates a BlockBasedTableFactory
[](const ConfigOptions& opts, const std::string& name,
const std::string& value, void* addr) {
BlockBasedTableOptions* old_opts = nullptr;
auto table_factory =
static_cast<std::shared_ptr<TableFactory>*>(addr);
if (table_factory->get() != nullptr) {
old_opts =
table_factory->get()->GetOptions<BlockBasedTableOptions>();
}
if (name == "block_based_table_factory") {
std::unique_ptr<TableFactory> new_factory;
if (old_opts != nullptr) {
new_factory.reset(NewBlockBasedTableFactory(*old_opts));
} else {
new_factory.reset(NewBlockBasedTableFactory());
}
Status s = new_factory->ConfigureFromString(opts, value);
if (s.ok()) {
table_factory->reset(new_factory.release());
}
return s;
} else if (old_opts != nullptr) {
return table_factory->get()->ConfigureOption(opts, name, value);
} else {
return Status::NotFound("Mismatched table option: ", name);
}
}}},
{"plain_table_factory",
{offsetof(struct ImmutableCFOptions, table_factory),
OptionType::kCustomizable, OptionVerificationType::kAlias,
OptionTypeFlags::kShared | OptionTypeFlags::kCompareLoose,
// Parses the input value and creates a PlainTableFactory
[](const ConfigOptions& opts, const std::string& name,
const std::string& value, void* addr) {
PlainTableOptions* old_opts = nullptr;
auto table_factory =
static_cast<std::shared_ptr<TableFactory>*>(addr);
if (table_factory->get() != nullptr) {
old_opts = table_factory->get()->GetOptions<PlainTableOptions>();
}
if (name == "plain_table_factory") {
std::unique_ptr<TableFactory> new_factory;
if (old_opts != nullptr) {
new_factory.reset(NewPlainTableFactory(*old_opts));
} else {
new_factory.reset(NewPlainTableFactory());
}
Status s = new_factory->ConfigureFromString(opts, value);
if (s.ok()) {
table_factory->reset(new_factory.release());
}
return s;
} else if (old_opts != nullptr) {
return table_factory->get()->ConfigureOption(opts, name, value);
} else {
return Status::NotFound("Mismatched table option: ", name);
}
}}},
{"table_properties_collectors",
OptionTypeInfo::Vector<
std::shared_ptr<TablePropertiesCollectorFactory>>(
offsetof(struct ImmutableCFOptions,
table_properties_collector_factories),
OptionVerificationType::kByName, OptionTypeFlags::kNone,
OptionTypeInfo::AsCustomSharedPtr<TablePropertiesCollectorFactory>(
0, OptionVerificationType::kByName, OptionTypeFlags::kNone))},
{"compaction_filter",
OptionTypeInfo::AsCustomRawPtr<const CompactionFilter>(
offsetof(struct ImmutableCFOptions, compaction_filter),
OptionVerificationType::kByName, OptionTypeFlags::kAllowNull)},
{"compaction_filter_factory",
OptionTypeInfo::AsCustomSharedPtr<CompactionFilterFactory>(
offsetof(struct ImmutableCFOptions, compaction_filter_factory),
OptionVerificationType::kByName, OptionTypeFlags::kAllowNull)},
{"merge_operator",
OptionTypeInfo::AsCustomSharedPtr<MergeOperator>(
offsetof(struct ImmutableCFOptions, merge_operator),
OptionVerificationType::kByNameAllowFromNull,
OptionTypeFlags::kCompareLoose | OptionTypeFlags::kAllowNull)},
{"compaction_style",
{offsetof(struct ImmutableCFOptions, compaction_style),
OptionType::kCompactionStyle, OptionVerificationType::kNormal,
OptionTypeFlags::kNone}},
{"compaction_pri",
{offsetof(struct ImmutableCFOptions, compaction_pri),
OptionType::kCompactionPri, OptionVerificationType::kNormal,
OptionTypeFlags::kNone}},
{"sst_partitioner_factory",
OptionTypeInfo::AsCustomSharedPtr<SstPartitionerFactory>(
offsetof(struct ImmutableCFOptions, sst_partitioner_factory),
OptionVerificationType::kByName, OptionTypeFlags::kAllowNull)},
};
const std::string OptionsHelper::kCFOptionsName = "ColumnFamilyOptions";
class ConfigurableMutableCFOptions : public Configurable {
public:
explicit ConfigurableMutableCFOptions(const MutableCFOptions& mcf) {
mutable_ = mcf;
RegisterOptions(&mutable_, &cf_mutable_options_type_info);
}
protected:
MutableCFOptions mutable_;
};
class ConfigurableCFOptions : public ConfigurableMutableCFOptions {
public:
ConfigurableCFOptions(const ColumnFamilyOptions& opts,
const std::unordered_map<std::string, std::string>* map)
: ConfigurableMutableCFOptions(MutableCFOptions(opts)),
immutable_(opts),
cf_options_(opts),
opt_map_(map) {
RegisterOptions(&immutable_, &cf_immutable_options_type_info);
}
protected:
Status ConfigureOptions(
const ConfigOptions& config_options,
const std::unordered_map<std::string, std::string>& opts_map,
std::unordered_map<std::string, std::string>* unused) override {
Status s = Configurable::ConfigureOptions(config_options, opts_map, unused);
if (s.ok()) {
UpdateColumnFamilyOptions(mutable_, &cf_options_);
UpdateColumnFamilyOptions(immutable_, &cf_options_);
s = PrepareOptions(config_options);
}
return s;
}
virtual const void* GetOptionsPtr(const std::string& name) const override {
if (name == OptionsHelper::kCFOptionsName) {
return &cf_options_;
} else {
return ConfigurableMutableCFOptions::GetOptionsPtr(name);
}
}
bool OptionsAreEqual(const ConfigOptions& config_options,
const OptionTypeInfo& opt_info,
const std::string& opt_name, const void* const this_ptr,
const void* const that_ptr,
std::string* mismatch) const override {
bool equals = opt_info.AreEqual(config_options, opt_name, this_ptr,
that_ptr, mismatch);
if (!equals && opt_info.IsByName()) {
if (opt_map_ == nullptr) {
equals = true;
} else {
const auto& iter = opt_map_->find(opt_name);
if (iter == opt_map_->end()) {
equals = true;
} else {
equals = opt_info.AreEqualByName(config_options, opt_name, this_ptr,
iter->second);
}
}
if (equals) { // False alarm, clear mismatch
*mismatch = "";
}
}
if (equals && opt_info.IsConfigurable() && opt_map_ != nullptr) {
const auto* this_config = opt_info.AsRawPointer<Configurable>(this_ptr);
if (this_config == nullptr) {
const auto& iter = opt_map_->find(opt_name);
// If the name exists in the map and is not empty/null,
// then the this_config should be set.
if (iter != opt_map_->end() && !iter->second.empty() &&
iter->second != kNullptrString) {
*mismatch = opt_name;
equals = false;
}
}
}
return equals;
}
private:
ImmutableCFOptions immutable_;
ColumnFamilyOptions cf_options_;
const std::unordered_map<std::string, std::string>* opt_map_;
};
std::unique_ptr<Configurable> CFOptionsAsConfigurable(
const MutableCFOptions& opts) {
std::unique_ptr<Configurable> ptr(new ConfigurableMutableCFOptions(opts));
return ptr;
}
std::unique_ptr<Configurable> CFOptionsAsConfigurable(
const ColumnFamilyOptions& opts,
const std::unordered_map<std::string, std::string>* opt_map) {
std::unique_ptr<Configurable> ptr(new ConfigurableCFOptions(opts, opt_map));
return ptr;
}
#endif // ROCKSDB_LITE
ImmutableCFOptions::ImmutableCFOptions() : ImmutableCFOptions(Options()) {}
ImmutableCFOptions::ImmutableCFOptions(const ColumnFamilyOptions& cf_options)
: compaction_style(cf_options.compaction_style),
compaction_pri(cf_options.compaction_pri),
user_comparator(cf_options.comparator),
internal_comparator(InternalKeyComparator(cf_options.comparator)),
merge_operator(cf_options.merge_operator),
compaction_filter(cf_options.compaction_filter),
compaction_filter_factory(cf_options.compaction_filter_factory),
min_write_buffer_number_to_merge(
cf_options.min_write_buffer_number_to_merge),
max_write_buffer_number_to_maintain(
cf_options.max_write_buffer_number_to_maintain),
max_write_buffer_size_to_maintain(
cf_options.max_write_buffer_size_to_maintain),
inplace_update_support(cf_options.inplace_update_support),
inplace_callback(cf_options.inplace_callback),
memtable_factory(cf_options.memtable_factory),
table_factory(cf_options.table_factory),
table_properties_collector_factories(
cf_options.table_properties_collector_factories),
bloom_locality(cf_options.bloom_locality),
compression_per_level(cf_options.compression_per_level),
level_compaction_dynamic_level_bytes(
cf_options.level_compaction_dynamic_level_bytes),
num_levels(cf_options.num_levels),
optimize_filters_for_hits(cf_options.optimize_filters_for_hits),
force_consistency_checks(cf_options.force_consistency_checks),
memtable_insert_with_hint_prefix_extractor(
cf_options.memtable_insert_with_hint_prefix_extractor),
cf_paths(cf_options.cf_paths),
compaction_thread_limiter(cf_options.compaction_thread_limiter),
sst_partitioner_factory(cf_options.sst_partitioner_factory) {}
ImmutableOptions::ImmutableOptions() : ImmutableOptions(Options()) {}
ImmutableOptions::ImmutableOptions(const Options& options)
: ImmutableOptions(options, options) {}
ImmutableOptions::ImmutableOptions(const DBOptions& db_options,
const ColumnFamilyOptions& cf_options)
: ImmutableDBOptions(db_options), ImmutableCFOptions(cf_options) {}
ImmutableOptions::ImmutableOptions(const DBOptions& db_options,
const ImmutableCFOptions& cf_options)
: ImmutableDBOptions(db_options), ImmutableCFOptions(cf_options) {}
ImmutableOptions::ImmutableOptions(const ImmutableDBOptions& db_options,
const ColumnFamilyOptions& cf_options)
: ImmutableDBOptions(db_options), ImmutableCFOptions(cf_options) {}
ImmutableOptions::ImmutableOptions(const ImmutableDBOptions& db_options,
const ImmutableCFOptions& cf_options)
: ImmutableDBOptions(db_options), ImmutableCFOptions(cf_options) {}
// Multiple two operands. If they overflow, return op1.
uint64_t MultiplyCheckOverflow(uint64_t op1, double op2) {
if (op1 == 0 || op2 <= 0) {
return 0;
}
if (port::kMaxUint64 / op1 < op2) {
return op1;
}
return static_cast<uint64_t>(op1 * op2);
}
// when level_compaction_dynamic_level_bytes is true and leveled compaction
// is used, the base level is not always L1, so precomupted max_file_size can
// no longer be used. Recompute file_size_for_level from base level.
uint64_t MaxFileSizeForLevel(const MutableCFOptions& cf_options,
int level, CompactionStyle compaction_style, int base_level,
bool level_compaction_dynamic_level_bytes) {
if (!level_compaction_dynamic_level_bytes || level < base_level ||
compaction_style != kCompactionStyleLevel) {
assert(level >= 0);
assert(level < (int)cf_options.max_file_size.size());
return cf_options.max_file_size[level];
} else {
assert(level >= 0 && base_level >= 0);
assert(level - base_level < (int)cf_options.max_file_size.size());
return cf_options.max_file_size[level - base_level];
}
}
size_t MaxFileSizeForL0MetaPin(const MutableCFOptions& cf_options) {
// We do not want to pin meta-blocks that almost certainly came from intra-L0
// or a former larger `write_buffer_size` value to avoid surprising users with
// pinned memory usage. We use a factor of 1.5 to account for overhead
// introduced during flush in most cases.
if (port::kMaxSizet / 3 < cf_options.write_buffer_size / 2) {
return port::kMaxSizet;
}
return cf_options.write_buffer_size / 2 * 3;
}
void MutableCFOptions::RefreshDerivedOptions(int num_levels,
CompactionStyle compaction_style) {
max_file_size.resize(num_levels);
for (int i = 0; i < num_levels; ++i) {
if (i == 0 && compaction_style == kCompactionStyleUniversal) {
max_file_size[i] = ULLONG_MAX;
} else if (i > 1) {
max_file_size[i] = MultiplyCheckOverflow(max_file_size[i - 1],
target_file_size_multiplier);
} else {
max_file_size[i] = target_file_size_base;
}
}
}
void MutableCFOptions::Dump(Logger* log) const {
// Memtable related options
ROCKS_LOG_INFO(log,
" write_buffer_size: %" ROCKSDB_PRIszt,
write_buffer_size);
ROCKS_LOG_INFO(log, " max_write_buffer_number: %d",
max_write_buffer_number);
ROCKS_LOG_INFO(log,
" arena_block_size: %" ROCKSDB_PRIszt,
arena_block_size);
ROCKS_LOG_INFO(log, " memtable_prefix_bloom_ratio: %f",
memtable_prefix_bloom_size_ratio);
ROCKS_LOG_INFO(log, " memtable_whole_key_filtering: %d",
memtable_whole_key_filtering);
ROCKS_LOG_INFO(log,
" memtable_huge_page_size: %" ROCKSDB_PRIszt,
memtable_huge_page_size);
ROCKS_LOG_INFO(log,
" max_successive_merges: %" ROCKSDB_PRIszt,
max_successive_merges);
ROCKS_LOG_INFO(log,
" inplace_update_num_locks: %" ROCKSDB_PRIszt,
inplace_update_num_locks);
ROCKS_LOG_INFO(log, " prefix_extractor: %s",
prefix_extractor == nullptr
? "nullptr"
: prefix_extractor->GetId().c_str());
ROCKS_LOG_INFO(log, " disable_auto_compactions: %d",
disable_auto_compactions);
ROCKS_LOG_INFO(log, " soft_pending_compaction_bytes_limit: %" PRIu64,
soft_pending_compaction_bytes_limit);
ROCKS_LOG_INFO(log, " hard_pending_compaction_bytes_limit: %" PRIu64,
hard_pending_compaction_bytes_limit);
ROCKS_LOG_INFO(log, " level0_file_num_compaction_trigger: %d",
level0_file_num_compaction_trigger);
ROCKS_LOG_INFO(log, " level0_slowdown_writes_trigger: %d",
level0_slowdown_writes_trigger);
ROCKS_LOG_INFO(log, " level0_stop_writes_trigger: %d",
level0_stop_writes_trigger);
ROCKS_LOG_INFO(log, " max_compaction_bytes: %" PRIu64,
max_compaction_bytes);
ROCKS_LOG_INFO(log, " target_file_size_base: %" PRIu64,
target_file_size_base);
ROCKS_LOG_INFO(log, " target_file_size_multiplier: %d",
target_file_size_multiplier);
ROCKS_LOG_INFO(log, " max_bytes_for_level_base: %" PRIu64,
max_bytes_for_level_base);
ROCKS_LOG_INFO(log, " max_bytes_for_level_multiplier: %f",
max_bytes_for_level_multiplier);
ROCKS_LOG_INFO(log, " ttl: %" PRIu64,
ttl);
ROCKS_LOG_INFO(log, " periodic_compaction_seconds: %" PRIu64,
periodic_compaction_seconds);
std::string result;
char buf[10];
for (const auto m : max_bytes_for_level_multiplier_additional) {
snprintf(buf, sizeof(buf), "%d, ", m);
result += buf;
}
if (result.size() >= 2) {
result.resize(result.size() - 2);
} else {
result = "";
}
ROCKS_LOG_INFO(log, "max_bytes_for_level_multiplier_additional: %s",
result.c_str());
ROCKS_LOG_INFO(log, " max_sequential_skip_in_iterations: %" PRIu64,
max_sequential_skip_in_iterations);
ROCKS_LOG_INFO(log, " check_flush_compaction_key_order: %d",
check_flush_compaction_key_order);
ROCKS_LOG_INFO(log, " paranoid_file_checks: %d",
paranoid_file_checks);
ROCKS_LOG_INFO(log, " report_bg_io_stats: %d",
report_bg_io_stats);
ROCKS_LOG_INFO(log, " compression: %d",
static_cast<int>(compression));
// Universal Compaction Options
ROCKS_LOG_INFO(log, "compaction_options_universal.size_ratio : %d",
compaction_options_universal.size_ratio);
ROCKS_LOG_INFO(log, "compaction_options_universal.min_merge_width : %d",
compaction_options_universal.min_merge_width);
ROCKS_LOG_INFO(log, "compaction_options_universal.max_merge_width : %d",
compaction_options_universal.max_merge_width);
ROCKS_LOG_INFO(
log, "compaction_options_universal.max_size_amplification_percent : %d",
compaction_options_universal.max_size_amplification_percent);
ROCKS_LOG_INFO(log,
"compaction_options_universal.compression_size_percent : %d",
compaction_options_universal.compression_size_percent);
ROCKS_LOG_INFO(log, "compaction_options_universal.stop_style : %d",
compaction_options_universal.stop_style);
ROCKS_LOG_INFO(
log, "compaction_options_universal.allow_trivial_move : %d",
static_cast<int>(compaction_options_universal.allow_trivial_move));
ROCKS_LOG_INFO(log, "compaction_options_universal.incremental : %d",
static_cast<int>(compaction_options_universal.incremental));
// FIFO Compaction Options
ROCKS_LOG_INFO(log, "compaction_options_fifo.max_table_files_size : %" PRIu64,
compaction_options_fifo.max_table_files_size);
ROCKS_LOG_INFO(log, "compaction_options_fifo.allow_compaction : %d",
compaction_options_fifo.allow_compaction);
// Blob file related options
ROCKS_LOG_INFO(log, " enable_blob_files: %s",
enable_blob_files ? "true" : "false");
ROCKS_LOG_INFO(log, " min_blob_size: %" PRIu64,
min_blob_size);
ROCKS_LOG_INFO(log, " blob_file_size: %" PRIu64,
blob_file_size);
ROCKS_LOG_INFO(log, " blob_compression_type: %s",
CompressionTypeToString(blob_compression_type).c_str());
ROCKS_LOG_INFO(log, " enable_blob_garbage_collection: %s",
enable_blob_garbage_collection ? "true" : "false");
ROCKS_LOG_INFO(log, " blob_garbage_collection_age_cutoff: %f",
blob_garbage_collection_age_cutoff);
ROCKS_LOG_INFO(log, " blob_garbage_collection_force_threshold: %f",
blob_garbage_collection_force_threshold);
ROCKS_LOG_INFO(log, " blob_compaction_readahead_size: %" PRIu64,
blob_compaction_readahead_size);
ROCKS_LOG_INFO(log, " bottommost_temperature: %d",
static_cast<int>(bottommost_temperature));
}
MutableCFOptions::MutableCFOptions(const Options& options)
: MutableCFOptions(ColumnFamilyOptions(options)) {}
#ifndef ROCKSDB_LITE
Status GetMutableOptionsFromStrings(
const MutableCFOptions& base_options,
const std::unordered_map<std::string, std::string>& options_map,
Logger* /*info_log*/, MutableCFOptions* new_options) {
assert(new_options);
*new_options = base_options;
ConfigOptions config_options;
Status s = OptionTypeInfo::ParseType(
config_options, options_map, cf_mutable_options_type_info, new_options);
if (!s.ok()) {
*new_options = base_options;
}
return s;
}
Status GetStringFromMutableCFOptions(const ConfigOptions& config_options,
const MutableCFOptions& mutable_opts,
std::string* opt_string) {
assert(opt_string);
opt_string->clear();
return OptionTypeInfo::SerializeType(
config_options, cf_mutable_options_type_info, &mutable_opts, opt_string);
}
#endif // ROCKSDB_LITE
} // namespace ROCKSDB_NAMESPACE
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